Photo by Melody

PlantFiles: Slender Mountian Mint, Appalachian Mountain Mint
Pycnanthemum flexuosum

Family: Lamiaceae (lay-mee-AY-see-ee) (Info)
Genus: Pycnanthemum (pik-NAN-thee-mum) (Info)
Species: flexuosum (fleks-yoo-OH-sum) (Info)

Synonym:Koellia hugeri
Synonym:Koellia hyssopifolia
Synonym:Pycnanthemum hyssopifolium

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24-36 in. (60-90 cm)

12-15 in. (30-38 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall

Grown for foliage

Other details:
Average Water Needs; Water regularly; do not overwater
Flowers are fragrant

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
By dividing the rootball
From semi-hardwood cuttings
By simple layering

Seed Collecting:
Unknown - Tell us

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By mystic
Thumbnail #1 of Pycnanthemum flexuosum by mystic

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By mgarr
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No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral mystic On Aug 30, 2001, mystic from Ewing, KY (Zone 6a) wrote:

An erect, many-branched, herbaceous perennial that grows 2-3' tall and has narrow, almost needle-like leaves and profuse clusters of small, white flowers which bloom in mid to late summer. All parts of the plant have a strong, mint-like aroma. Not invasive like other mints.


This plant has been said to grow in the following regions:

Pelsor, Arkansas
Corydon, Kentucky
Ewing, Kentucky
Wilkes Barre, Pennsylvania
Leesburg, Virginia

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